Going to try to help you on this one,, it's free advice, may not be good but it's free.
I am running holley hp on a ls3 with fast 85lbs injectors. I had to email fast and get the injector off time and install in the computer. I am not sure if you have done this or not. Here is what they emailed me back on my injectors
8V - 1.76 ms
9V - 1.29 ms
10V - 1.00 ms
11V - 0.78 ms
12V - 0.63 ms
13V - 0.50 ms
14V - 0.41 ms
16V - 0.19 ms
Good luck
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